id summary reporter owner description type status component version resolution keywords cc guest host 13288 Host-only network adapter causes conflicts, lies about disabled status scovich "After installing VirtualBox on my Win7/x64 machine, I noticed that I can no longer send email. Thunderbird produces the message ""An error occurred sending mail: The mail server sent an incorrect greeting: 4.3.2 Connection rate limit exceeded.."" I had never seen this error before until installing VirtualBox, and the error started popping up immediately afterward. Unfortunately, disabling the host-only network adapter does not fix the problem. I actually don't think the adapter is disabled at all, though: the guest can access the internet just fine with it disabled. Connecting to a VPN fixes the problem, but the guest cannot access the network while the host is connected to the VPN. Google turned up nothing, nor did a bug search. Bug #8698 seemed similar, though, and I tried changing the metric as advised in the comments there; no luck, the behavior persists. VBox.log contains nothing related to networking (just a ton of messages about seamless mode and window resizing). I realize the true test would be to uninstall VirtualBox and see if the problem goes away, but that would undo many hours of work to get the thing running so I didn't try it. Happy to try workarounds and/or diagnose further, but currently out of ideas..." defect closed network/hostif VirtualBox 4.3.14 invalid Linux Windows